question_answer

A tarnado consists of rapidly whirling air vortex. Why is the pressure always much lower in the centre than at the outside? How does this condition account for the destructive power of tarnado?

Answer:

                The angular velocity of air in a tarnado increases as it goes towards the centre. As the air moves towards the centre, its moment of inertia (\[I\]) decreases and to conserve angular momentum (\[L=I\omega \]), the angular velocity co increases. Because of the enormous increase in velocity of inner layers, the air pressure at the centre reduces greatly in accordance with Bernoulli's theorem. This sudden reduction in pressure may prove highly disastrous both for life and property in the vicinity of a tarnado.